[TechAssist] Re: Toshiba Projo Model TP55F81\TAC-9678 Chasis\in shutdn.
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 17 Jun 2005 09:24:55 -0400
I sent it to him already.
Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager / Parts Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxx
----- Original Message -----
From: "tvservice" <tvservice@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, June 17, 2005 9:25 AM
Subject: [TechAssist] Re: Toshiba Projo Model TP55F81\TAC-9678 Chasis\in
shutdn.
Mando
do you have the shutdown troubleshooting manual?
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
----- Original Message -----
From: "armando guerra" <birdie@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, June 16, 2005 10:06 PM
Subject: [TechAssist] Re: Toshiba Projo Model TP55F81\TAC-9678 Chasis\in
shutdn.
> I had a good used dpc module that I had tried but still went into
shutdn.As for
> the yoke or pix tube,I have disconnected the crt bd and yoke from each of
the
> crts one at a time to see if eighter one was causing the problem but the
tv will
> still shut dn.Will keep hunting and will post if I have any good news.
Thanks
> Mando
> Birdie's TV & Electronics
> Casa Grande, AZ
>
> tvservice wrote:
>
> > Mando
> > pull the dpc module out and look for open resistor and leaky protect
> > transistor
> > you should see where it overheated
> > This model also has a history with me anyway of bad yokes mostly the
blue
> > and/or broken blue crt
> > Robert
> > tvservice@xxxxxxxxxxxxx
> > H & H Electronics Inc
> >
> > ----- Original Message -----
> > From: "armando guerra" <birdie@xxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Wednesday, June 15, 2005 5:18 PM
> > Subject: [TechAssist] Re: Toshiba Projo Model TP55F81\TAC-9678 Chasis\in
> > shutdn.
> >
> > > Hello Bob.I had the origional Toshiba's STK-392-110 in stock and tried
> > them but I
> > > still have the shutdn problem.I know that this sets have a big history
of
> > this
> > > ic's causing shutdn but from my exp.on this sets,if the problem is in
the
> > > convergence ic's,the set will power up by disconnecting connector P712
and
> > fuse
> > > F850 from the power\conv.bd.The picture will be pretty well off
alignment
> > as far
> > > as convergence but it will come on.I think I'll leave it alone till
the
> > morning
> > > when I won't be too tired of it and will try to figure it out.I even
tried
> > a new
> > > Q801 (Reg.) in the high voltage\sweep bd but no luck.I also removed
> > > F470,installed a 60w bulb in its place to check and see if it was
> > regulating at
> > > 125v and its at 124.5v.I am stunned.Since I am not an ASC for
toshiba,I
> > cannot
> > > get in the website to see any troubleshooting flow charts or
tips.Thanks .
> > > Mando
> > > Birdie's TV & Electronics
> > > Casa GRande, AZ
> > >
> > > Gemini Computer & TV wrote:
> > >
> > > > I am 99.9 % certain that if you replace the convergence ICs, your
set
> > will
> > > > be fixed ( I realize it may not be exhibiting any convergence type
> > symptoms
> > > > but you just have to trust me on this one). That set uses STK392-110
but
> > I
> > > > would use good quality STK392-150 or STK392-180 as replacements
(higher
> > > > power ratings aand far more reliable).
> > > >
> > > > Bob Waterman, CET® #RI-28
> > > > Master Technician License #9109
> > > > Service Manager / Parts Manager
> > > > Gemini Computer, TV, & Security Alarms
> > > > (508)695-7302
> > > > (508)695-7769 FAX
> > > > geminitv@xxxxxxxxxxx
> > > >
> > > > ----- Original Message -----
> > > > From: "armando guerra" <birdie@xxxxxxxxxxxxx>
> > > > To: <techassist@xxxxxxxxxxxxx>
> > > > Sent: Wednesday, June 15, 2005 2:35 PM
> > > > Subject: [TechAssist] Toshiba Projo Model TP55F81\TAC-9678 Chasis\in
> > shutdn.
> > > >
> > > > I am hoping that someone can give me their opinion on this problem
.At
> > > > power up,high voltage comes up for a few sec.and then the tv
shutsdn.Led
> > > > is blinking.To isolate the convergence ic's,I removed connector P712
and
> > > > F850 from the conv.\power bd and it still shutdn.I even removed the
> > > > conv.yokes from that bd and no go.Now,I removed all 3 crt bds,one at
a
> > > > time with their respective yokes and still went into shutdn,so the
crts
> > > > are not the problem.I replaced the vertical ic LA7833 since it can
cause
> > > > shutdn but did not help.I unsoldered the audio ic LA4282 to see if
that
> > > > was the cause and still no luck.Here is the only hint.No matter what
> > > > yoke (not convergence)I remove and fire the tv up,the high voltage
comes
> > > > up and stay's there,will not shut dn.However,there is no pix or
sound.At
> > > > first,I tought it was that particular yoke as I removed the conn but
the
> > > > high voltage stay's up,no matter which of the 3 yokes I disconnect.I
am
> > > > running out of idea's and my hair is getting whiter so I hope that
> > > > someone can help. Thanks for your help.
> > > > Mando
> > > > Birdie's TV & Electronics
> > > > Casa GRande,AZ
> > > >
> > >
> >
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